前面介紹了六種.NET組件，其中有一種組件是寫文件的壓縮和解壓，現(xiàn)在介紹另一種文件的解壓縮組件SharpZipLib。在這個組件介紹系列中，只為簡單的介紹組件的背景和簡單的應(yīng)用，讀者在閱讀時可以結(jié)合官網(wǎng)的相關(guān)介紹和在本地實際操作。
相關(guān)的組件功能非常強大，在筆者的介紹中只是提及到簡單的應(yīng)用，需要了解更多的操作和特性，可以根據(jù)官網(wǎng)介紹，或者查看DLL文件的相關(guān)類和方法，以此來擴展相關(guān)的業(yè)務(wù)需要。
SharpZipLib是一個完全在C＃中為.NET平臺編寫的Zip，GZip，Tar和BZip2庫。
一.SharpZipLib組件概述：
ziplib（SharpZipLib，以前的NZipLib）是一個完全在C＃為.NET平臺編寫的Zip，GZip，Tar和BZip2庫。它實現(xiàn)為一個程序集（可安裝在GAC中），因此可以輕松地集成到其他項目（任何.NET語言）中。 #ziplib的創(chuàng)建者這樣說：“我已經(jīng)將zip庫移植到C＃，因為我需要gzip / zip壓縮，我不想使用libzip.dll或類似的東西我想要的所有在純C＃“。
SharpZipLib官網(wǎng)提供的下載操作：.NET 1.1，.NET 2.0（3.5，4.0），.NET CF 1.0，.NET CF 2.0的裝配：下載237 KB，源代碼和示例下載708 KB；源代碼和示例下載708 KB；幫助文件下載1208 KB；
SharpZipLib是在GPL下發(fā)布，遵守開源協(xié)議。
二.SharpZipLib核心類和方法介紹：
以上簡單的介紹了SharpZipLib組件的相關(guān)背景，現(xiàn)在具體看一下該組件的相關(guān)核心類和方法：
1.ZipOutputStream類PutNextEntry()：
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public void PutNextEntry(ZipEntry entry){ bool hasCrc; if (entry == null) { throw new ArgumentNullException("entry"); } if (this.entries == null) { throw new InvalidOperationException("ZipOutputStream was finished"); } if (this.curEntry != null) { this.CloseEntry(); } if (this.entries.Count == 0x7fffffff) { throw new ZipException("Too many entries for Zip file"); } CompressionMethod compressionMethod = entry.CompressionMethod; int defaultCompressionLevel = this.defaultCompressionLevel; entry.Flags &= 0x800; this.patchEntryHeader = false; if (entry.Size == 0L) { entry.CompressedSize = entry.Size; entry.Crc = 0L; compressionMethod = CompressionMethod.Stored; hasCrc = true; } else { hasCrc = (entry.Size >= 0L) && entry.HasCrc; if (compressionMethod == CompressionMethod.Stored) { if (!hasCrc) { if (!base.CanPatchEntries) { compressionMethod = CompressionMethod.Deflated; defaultCompressionLevel = 0; } } else { entry.CompressedSize = entry.Size; hasCrc = entry.HasCrc; } } } if (!hasCrc) { if (!base.CanPatchEntries) { entry.Flags |= 8; } else { this.patchEntryHeader = true; } } if (base.Password != null) { entry.IsCrypted = true; if (entry.Crc < 0L) { entry.Flags |= 8; } } entry.Offset = this.offset; entry.CompressionMethod = compressionMethod; this.curMethod = compressionMethod; this.sizePatchPos = -1L; if ((this.useZip64_ == UseZip64.On) || ((entry.Size < 0L) && (this.useZip64_ == UseZip64.Dynamic))) { entry.ForceZip64(); } this.WriteLeInt(0x4034b50); this.WriteLeShort(entry.Version); this.WriteLeShort(entry.Flags); this.WriteLeShort((byte) entry.CompressionMethodForHeader); this.WriteLeInt((int) entry.DosTime); if (hasCrc) { this.WriteLeInt((int) entry.Crc); if (entry.LocalHeaderRequiresZip64) { this.WriteLeInt(-1); this.WriteLeInt(-1); } else { this.WriteLeInt(entry.IsCrypted ? (((int) entry.CompressedSize) + 12) : ((int) entry.CompressedSize)); this.WriteLeInt((int) entry.Size); } } else { if (this.patchEntryHeader) { this.crcPatchPos = base.baseOutputStream_.Position; } this.WriteLeInt(0); if (this.patchEntryHeader) { this.sizePatchPos = base.baseOutputStream_.Position; } if (entry.LocalHeaderRequiresZip64 || this.patchEntryHeader) { this.WriteLeInt(-1); this.WriteLeInt(-1); } else { this.WriteLeInt(0); this.WriteLeInt(0); } } byte[] buffer = ZipConstants.ConvertToArray(entry.Flags, entry.Name); if (buffer.Length > 0xffff) { throw new ZipException("Entry name too long."); } ZipExtraData extraData = new ZipExtraData(entry.ExtraData); if (entry.LocalHeaderRequiresZip64) { extraData.StartNewEntry(); if (hasCrc) { extraData.AddLeLong(entry.Size); extraData.AddLeLong(entry.CompressedSize); } else { extraData.AddLeLong(-1L); extraData.AddLeLong(-1L); } extraData.AddNewEntry(1); if (!extraData.Find(1)) { throw new ZipException("Internal error cant find extra data"); } if (this.patchEntryHeader) { this.sizePatchPos = extraData.CurrentReadIndex; } } else { extraData.Delete(1); } if (entry.AESKeySize > 0) { AddExtraDataAES(entry, extraData); } byte[] entryData = extraData.GetEntryData(); this.WriteLeShort(buffer.Length); this.WriteLeShort(entryData.Length); if (buffer.Length > 0) { base.baseOutputStream_.Write(buffer, 0, buffer.Length); } if (entry.LocalHeaderRequiresZip64 && this.patchEntryHeader) { this.sizePatchPos += base.baseOutputStream_.Position; } if (entryData.Length > 0) { base.baseOutputStream_.Write(entryData, 0, entryData.Length); } this.offset += (30 + buffer.Length) + entryData.Length; if (entry.AESKeySize > 0) { this.offset += entry.AESOverheadSize; } this.curEntry = entry; this.crc.Reset(); if (compressionMethod == CompressionMethod.Deflated) { base.deflater_.Reset(); base.deflater_.SetLevel(defaultCompressionLevel); } this.size = 0L; if (entry.IsCrypted) { if (entry.AESKeySize > 0) { this.WriteAESHeader(entry); } else if (entry.Crc < 0L) { this.WriteEncryptionHeader(entry.DosTime << 0x10); } else { this.WriteEncryptionHeader(entry.Crc); } }} |
2.ZipOutputStream類Finish()：
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public override void Finish(){ if (this.entries != null) { if (this.curEntry != null) { this.CloseEntry(); } long count = this.entries.Count; long sizeEntries = 0L; foreach (ZipEntry entry in this.entries) { this.WriteLeInt(0x2014b50); this.WriteLeShort(0x33); this.WriteLeShort(entry.Version); this.WriteLeShort(entry.Flags); this.WriteLeShort((short) entry.CompressionMethodForHeader); this.WriteLeInt((int) entry.DosTime); this.WriteLeInt((int) entry.Crc); if (entry.IsZip64Forced() || (entry.CompressedSize >= 0xffffffffL)) { this.WriteLeInt(-1); } else { this.WriteLeInt((int) entry.CompressedSize); } if (entry.IsZip64Forced() || (entry.Size >= 0xffffffffL)) { this.WriteLeInt(-1); } else { this.WriteLeInt((int) entry.Size); } byte[] buffer = ZipConstants.ConvertToArray(entry.Flags, entry.Name); if (buffer.Length > 0xffff) { throw new ZipException("Name too long."); } ZipExtraData extraData = new ZipExtraData(entry.ExtraData); if (entry.CentralHeaderRequiresZip64) { extraData.StartNewEntry(); if (entry.IsZip64Forced() || (entry.Size >= 0xffffffffL)) { extraData.AddLeLong(entry.Size); } if (entry.IsZip64Forced() || (entry.CompressedSize >= 0xffffffffL)) { extraData.AddLeLong(entry.CompressedSize); } if (entry.Offset >= 0xffffffffL) { extraData.AddLeLong(entry.Offset); } extraData.AddNewEntry(1); } else { extraData.Delete(1); } if (entry.AESKeySize > 0) { AddExtraDataAES(entry, extraData); } byte[] entryData = extraData.GetEntryData(); byte[] buffer3 = (entry.Comment != null) ? ZipConstants.ConvertToArray(entry.Flags, entry.Comment) : new byte[0]; if (buffer3.Length > 0xffff) { throw new ZipException("Comment too long."); } this.WriteLeShort(buffer.Length); this.WriteLeShort(entryData.Length); this.WriteLeShort(buffer3.Length); this.WriteLeShort(0); this.WriteLeShort(0); if (entry.ExternalFileAttributes != -1) { this.WriteLeInt(entry.ExternalFileAttributes); } else if (entry.IsDirectory) { this.WriteLeInt(0x10); } else { this.WriteLeInt(0); } if (entry.Offset >= 0xffffffffL) { this.WriteLeInt(-1); } else { this.WriteLeInt((int) entry.Offset); } if (buffer.Length > 0) { base.baseOutputStream_.Write(buffer, 0, buffer.Length); } if (entryData.Length > 0) { base.baseOutputStream_.Write(entryData, 0, entryData.Length); } if (buffer3.Length > 0) { base.baseOutputStream_.Write(buffer3, 0, buffer3.Length); } sizeEntries += ((0x2e + buffer.Length) + entryData.Length) + buffer3.Length; } using (ZipHelperStream stream = new ZipHelperStream(base.baseOutputStream_)) { stream.WriteEndOfCentralDirectory(count, sizeEntries, this.offset, this.zipComment); } this.entries = null; }} |
3.ZipEntry類Clone()：
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public object Clone(){ ZipEntry entry = (ZipEntry) base.MemberwiseClone(); if (this.extra != null) { entry.extra = new byte[this.extra.Length]; Array.Copy(this.extra, 0, entry.extra, 0, this.extra.Length); } return entry;} |
4.ZipOutputStream類Write()：
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public override void Write(byte[] buffer, int offset, int count){ if (this.curEntry == null) { throw new InvalidOperationException("No open entry."); } if (buffer == null) { throw new ArgumentNullException("buffer"); } if (offset < 0) { throw new ArgumentOutOfRangeException("offset", "Cannot be negative"); } if (count < 0) { throw new ArgumentOutOfRangeException("count", "Cannot be negative"); } if ((buffer.Length - offset) < count) { throw new ArgumentException("Invalid offset/count combination"); } this.crc.Update(buffer, offset, count); this.size += count; switch (this.curMethod) { case CompressionMethod.Stored: if (base.Password != null) { this.CopyAndEncrypt(buffer, offset, count); } else { base.baseOutputStream_.Write(buffer, offset, count); } break; case CompressionMethod.Deflated: base.Write(buffer, offset, count); break; }} |
三.SharpZipLib實例：
1.壓縮單個文件：
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/// <summary> /// 壓縮單個文件 /// </summary> /// <param name="fileToZip">要壓縮的文件</param> /// <param name="zipedFile">壓縮后的文件</param> /// <param name="compressionLevel">壓縮等級</param> /// <param name="blockSize">每次寫入大小</param> public static void ZipFile(string fileToZip, string zipedFile, int compressionLevel, int blockSize) { if (string.IsNullOrEmpty(fileToZip)) { throw new ArgumentNullException(fileToZip); } if (string.IsNullOrEmpty(zipedFile)) { throw new ArgumentNullException(zipedFile); } if (!File.Exists(fileToZip)) { throw new FileNotFoundException("指定要壓縮的文件: " + fileToZip + " 不存在!"); } try { using (var zipFile = File.Create(zipedFile)) { using (var zipStream = new ZipOutputStream(zipFile)) { using (var streamToZip = new FileStream(fileToZip, FileMode.Open, FileAccess.Read)) { var fileName = fileToZip.Substring(fileToZip.LastIndexOf("\\", StringComparison.Ordinal) + 1); var zipEntry = new ZipEntry(fileName); zipStream.PutNextEntry(zipEntry); zipStream.SetLevel(compressionLevel); var buffer = new byte[blockSize]; try { int sizeRead; do { sizeRead = streamToZip.Read(buffer, 0, buffer.Length); zipStream.Write(buffer, 0, sizeRead); } while (sizeRead > 0); } catch (Exception ex) { throw new Exception(ex.Message); } streamToZip.Close(); } zipStream.Finish(); zipStream.Close(); } zipFile.Close(); } } catch (IOException ioex) { throw new IOException(ioex.Message); } catch (Exception ex) { throw new Exception(ex.Message); } } |
2. 壓縮單個文件：
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/// <summary>/// 壓縮單個文件/// </summary>/// <param name="fileToZip">要進(jìn)行壓縮的文件名</param>/// <param name="zipedFile">壓縮后生成的壓縮文件名</param>public static void ZipFile(string fileToZip, string zipedFile){ if (string.IsNullOrEmpty(fileToZip)) { throw new ArgumentException(fileToZip); } if (string.IsNullOrEmpty(zipedFile)) { throw new ArgumentException(zipedFile); } if (!File.Exists(fileToZip)) { throw new FileNotFoundException("指定要壓縮的文件: " + fileToZip + " 不存在!"); } try { using (var fs = File.OpenRead(fileToZip)) { var buffer = new byte[fs.Length]; fs.Read(buffer, 0, buffer.Length); fs.Close(); using (var zipFile = File.Create(zipedFile)) { using (var zipStream = new ZipOutputStream(zipFile)) { var fileName = fileToZip.Substring(fileToZip.LastIndexOf("\\", StringComparison.Ordinal) + 1); var zipEntry = new ZipEntry(fileName); zipStream.PutNextEntry(zipEntry); zipStream.SetLevel(5); zipStream.Write(buffer, 0, buffer.Length); zipStream.Finish(); zipStream.Close(); } } } } catch (IOException ioex) { throw new IOException(ioex.Message); } catch (Exception ex) { throw new Exception(ex.Message); }} |
3.壓縮多層目錄：
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/// <summary> /// 壓縮多層目錄 /// </summary> /// <param name="strDirectory">目錄</param> /// <param name="zipedFile">壓縮文件</param> public static void ZipFileDirectory(string strDirectory, string zipedFile) { if (string.IsNullOrEmpty(strDirectory)) { throw new ArgumentException(strDirectory); } if (string.IsNullOrEmpty(zipedFile)) { throw new ArgumentException(zipedFile); } using (var zipFile = File.Create(zipedFile)) { using (var s = new ZipOutputStream(zipFile)) { ZipSetp(strDirectory, s, ""); } } } |
4.遞歸遍歷目錄：
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/// <summary>/// 遞歸遍歷目錄/// </summary>/// <param name="strDirectory">目錄</param>/// <param name="s">ZipOutputStream對象</param>/// <param name="parentPath">父路徑</param>private static void ZipSetp(string strDirectory, ZipOutputStream s, string parentPath){ if (strDirectory[strDirectory.Length - 1] != Path.DirectorySeparatorChar) { strDirectory += Path.DirectorySeparatorChar; } var crc = new Crc32(); var filenames = Directory.GetFileSystemEntries(strDirectory); try { // 遍歷所有的文件和目錄 foreach (var file in filenames) { // 先當(dāng)作目錄處理如果存在這個目錄就遞歸Copy該目錄下面的文件 if (Directory.Exists(file)) { var pPath = parentPath; pPath += file.Substring(file.LastIndexOf("\\", StringComparison.Ordinal) + 1); pPath += "\\"; ZipSetp(file, s, pPath); } // 否則直接壓縮文件 else { //打開壓縮文件 using (var fs = File.OpenRead(file)) { var buffer = new byte[fs.Length]; fs.Read(buffer, 0, buffer.Length); var fileName = parentPath + file.Substring(file.LastIndexOf("\\", StringComparison.Ordinal) + 1); var entry = new ZipEntry(fileName) { DateTime = DateTime.Now, Size = fs.Length }; fs.Close(); crc.Reset(); crc.Update(buffer); entry.Crc = crc.Value; s.PutNextEntry(entry); s.Write(buffer, 0, buffer.Length); } } } } catch (IOException ioex) { throw new IOException(ioex.Message); } catch (Exception ex) { throw new Exception(ex.Message); }} |
5.解壓縮一個 zip 文件：
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/// <summary>/// 解壓縮一個 zip 文件。/// </summary>/// <param name="zipedFile">The ziped file.</param>/// <param name="strDirectory">The STR directory.</param>/// <param name="password">zip 文件的密碼。</param>/// <param name="overWrite">是否覆蓋已存在的文件。</param>public void UnZip(string zipedFile, string strDirectory, string password, bool overWrite){ if (string.IsNullOrEmpty(zipedFile)) { throw new ArgumentException(zipedFile); } if (string.IsNullOrEmpty(strDirectory)) { throw new ArgumentException(strDirectory); } if (string.IsNullOrEmpty(password)) { throw new ArgumentException(password); } if (strDirectory == "") { strDirectory = Directory.GetCurrentDirectory(); } if (!strDirectory.EndsWith("\\")) { strDirectory = strDirectory + "\\"; } try { using (var s = new ZipInputStream(File.OpenRead(zipedFile))) { s.Password = password; ZipEntry theEntry; while ((theEntry = s.GetNextEntry()) != null) { var directoryName = string.Empty; var pathToZip = theEntry.Name; if (pathToZip != "") { directoryName = Path.GetDirectoryName(pathToZip) + "\\"; } var fileName = Path.GetFileName(pathToZip); Directory.CreateDirectory(strDirectory + directoryName); if (fileName == "") continue; if ((!File.Exists(strDirectory + directoryName + fileName) || !overWrite) && (File.Exists(strDirectory + directoryName + fileName))) continue; using (var streamWriter = File.Create(strDirectory + directoryName + fileName)) { var data = new byte[2048]; while (true) { var size = s.Read(data, 0, data.Length); if (size > 0) streamWriter.Write(data, 0, size); else break; } streamWriter.Close(); } } s.Close(); } } catch (IOException ioex) { throw new IOException(ioex.Message); } catch (Exception ex) { throw new Exception(ex.Message); }} |
四.總結(jié)：
以上是對SharpZipLib組件的相關(guān)介紹，本文的講解上比較的淺顯，如果需要深入的學(xué)習(xí)可以進(jìn)入官網(wǎng)進(jìn)行詳細(xì)的學(xué)習(xí)。組件的功能是很強大的，如何在項目中使用組件，完成我們在項目中需要實現(xiàn)的功能，這就是對每個開發(fā)者提出了要求，需要我們仔細(xì)的去考慮。
任何學(xué)習(xí)都需要我們自己去探索和思考，對于一個開發(fā)者來說，最重要的就是思考，因為在我們的職業(yè)生涯中，沒有什么的重要性能夠超過思考。如果有不足之處還望各位讀者包含，并留言指正。
原文鏈接：http://www.cnblogs.com/pengze0902/p/6159497.html
